Wireless Transmitter Phase Control for Multi-User Diversity
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Solution Overview
Problem
Conventional wireless transmission techniques experience a reduction in communication quality when multiple terminals attempt to communicate using chunks belonging to a frequency band with good reception quality, limiting the number of receivers that can maintain good communication quality with the wireless transmitter.
Innovation Solution
A wireless transmitter with multiple transmission antennas and a transmission circuit controller that assigns communication frequency bands and times based on reported reception qualities, applying different delays and phase-control to subcarrier signals to create frequency diversity or multi-user diversity regions, ensuring optimal signal reception even in bands with poor reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple terminals are assigned to chunks in frequency bands with good reception quality, then communication quality for those terminals is improved, but the number of terminals that can maintain good communication quality is limited
Solution Approach 1:
The patent applies phase rotation to transmission signals in specific chunks, changing the signal parameters to improve reception quality. By controlling the phase of transmission signals in chunks with poor reception quality, the system enables more terminals to achieve good communication quality, thus resolving the contradiction between maintaining high communication quality and supporting more terminals.
Solution Approach 2:
The system dynamically determines whether to apply phase rotation based on reception quality measurements. The base station controls the phase of transmission signals adaptively for different terminals and chunks, allowing the system to optimize communication quality for multiple terminals by dynamically adjusting signal parameters rather than using a fixed transmission approach.
2Reliability
If phase control is applied to improve reception quality in poor frequency bands, then more terminals can maintain good communication quality, but system complexity increases
Solution Approach 1:
The patent controls the phase of transmission signals as a parameter change to improve reception quality. By applying phase rotation only in specific chunks where reception quality is poor, rather than across all transmissions, the system improves reliability while minimizing the increase in system complexity. The phase control is applied selectively based on measured reception conditions.
Solution Approach 2:
The system uses feedback from reception quality measurements to determine when and how to apply phase control. Terminals report reception quality information to the base station, which then decides whether to apply phase rotation in subsequent transmissions. This feedback mechanism allows the system to improve reception quality adaptively without requiring complex predetermined control structures.
Data Source
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Figure 3A~3C
AI summary
A wireless transmitter of the present invention includes n (n being an integer of 2 or more) transmission antennas, a transmission circuit controller that, based on reception qualities reported from terminals, assigns a chunk to each terminal, and sends a phase-control report signal that determines whether to perform phase-control, to that chunk, and a transmission circuit unit that, to each of the n transmission antennas, performs phase-control based on the phase-control report signal, and applies a delay that obtains an optimum transmission diversity effect among a plurality of transmission diversity effects.